The original
spamchk filter used by postfix is described on
http://www.akadia.com/services/postfix_spamassassin.html. Remebered to post some advanced settings i made, you find it usefull if you want to split email to
spam,
nospam and
inbetween (lightspam).
#!/bin/sh
# -----------------------------------------------------------------
# File: spamchk
# Purpose: SPAMASSASIN shell-based filter
# Location: /usr/local/bin
# Usage: Call this script from master.cf (Postfix)
# Certified: GENTOO Linux, Spamassassin 3.0, Postfix
# -----------------------------------------------------------------
# Variables
#SENDMAIL="/usr/local/postfix/sendmail/sendmail -i"
SENDMAIL="/usr/sbin/sendmail -i"
EGREP=/bin/egrep
# Exit codes from
EX_UNAVAILABLE=69
# Number of *'s in X-Spam-level header needed to sideline message:
# (Eg. Score of 5.5 = "*****" )
SPAMLIMIT=4.5
SPAMLIMITKILL=6.1
# Clean up when done or when aborting.
trap "rm -f /var/tempfs/out.$$" 0 1 2 3 15
# Pipe message to spamc
cat | /usr/bin/spamc -s 1024000 -u filter > /var/tempfs/out.$$
#----- advanced AWK filter by simakas --------------------------------
# 050915 AWK part and splitting method to light_spam & spam
STATUS=`more /var/tempfs/out.$$ | grep -m 1 X-Spam-Status | awk '{print $3}' | awk -F= '{print $2}'`
warn=$(LC_ALL=C awk 'BEGIN{if('$STATUS'>='$SPAMLIMIT')print "SPAM";else print "NOSPAM"}')
kill=$(LC_ALL=C awk 'BEGIN{if('$STATUS'>='$SPAMLIMITKILL')print "SPAM";else print "NOSPAM"}')
# Are there more than $SPAMLIMIT stars in X-Spam-Level header? :
#if $EGREP -q "^X-Spam-Level: \*{$SPAMLIMIT,}" < /var/tempfs/out.$$
if [ "$warn" = "SPAM" ]
then
# Option 1: Move high scoring messages to sideline dir so
# a human can look at them later:
# mv out.$$ $SIDELINE_DIR/`date +%Y-%m-%d_%R`-$$
# Option 2: Divert to an alternate e-mail address:
# 050915 Drop mail if SPAMLIMITKILL is reached or deliver it to human recheck
# if $EGREP -q "^X-Spam-Level: \*{$SPAMLIMITKILL,}" < /var/tempfs/out.$$
if [ "$kill" = "SPAM" ]
then
#Drop it like its hot
#cp /var/tempfs/out.$$ /tmp/`date +%Y-%m-%d_%R`-$$
rm -f /var/tempfs/out.$$
else
#Or deliver to trashbox for human action
$SENDMAIL trash@svelita.lt < /var/tempfs/out.$$
fi
# Option 3: Delete the message
#rm -f /var/tempfs/out.$$
else
$SENDMAIL "$@" < /var/tempfs/out.$$
fi
# Postfix returns the exit status of the Postfix sendmail command.
exit $?
A web hosting company allegedly responsible for at least 75% of the daily spam volume worldwide has been forced offline, thanks to evidence gathered by security experts. Experts say the company hosts a vast community of cyber criminals including spammers, phishers, malware distributors and even peddlers of child porn. But will the move really take a bite out of cybercrime? Probably not. The criminals will in all likelihood move their operations elsewhere, most likely to an overseas host. As long as there are webhosting firms willing to look the other way, these shutdowns will only be temporary obstacles rather than permanent solutions.
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